Data loss on HDD due to formatting, trying to get data back

Hey guys,
I'm an idiot. I'll get that out of the way right now. I'm sure you'll agree with me when you read this.
I had three partitions, OSX, one for Windows 7 and one for xp. HFS+J, NTFS, NTFS. I realized i wasn't using the Windows installations, and that I'd rather have the empty space back for my mac.
I went into disk utility and deleted those two partitions.
I restarted to make sure it worked. But now it can't find even my HFS partition.
I used TestDrive, a free terminal-based piece of software to try to rebuild my partition map. No avail. On the other hand, I know what the start and end sectors are of the partition I want to recover. I don't care for the windows ones.
I used the terminal "dd" command to make a sector-by-sector copy of it to a .dmg, but when i try to mount it, my mac tells me that it has no partition map and cannot be mounted.
I don't want to spend money on this.
I did not do a zero-data format. My data IS definitely on the drive. I never modified the drive after my accidental format.
I pulled the drive out of my mac and installed a new one in. It was time for an upgrade anyway.
On the new one, i reinstalled OS X 10.5.I don't know where my 10.6 disk is. The old partition was running Snow Leopard. That's where I've been transferring all this data to, but the transferred data doesn't mount.
In the long run, I have an external HDD that i would put the final .dmg on. The .dmg would be an exact copy of my currently nonexistent partition so that I could just boot into my OSX disk and use Disk Utility to "restore" my new HDD to mirror that image.
That should work, right?
Any help would be much appreciated.
Thanks,
pchalla90

That should work, right?
Probably not. It is unlikely that the dd command copied the partition data necessary for Disk Utility to restore the raw sector contents to a partition -- basically, you have nothing to tell it how to map the file system (assuming it is intact) into the partition scheme of the drive. I'm not familiar with TestDrive, so I don't know if or how it could supply this missing info, but my guess is that you will have to do that to use the dmg.
Whatever you do, do not allow anything to be written to the original drive. Data recovery directly from it may be your only hope.

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